Door mechanism



Sept. 20, 1932. 5, RQSENFELT 1,878,892

DOOR MECHANISM Filed Feb. 15, 1929 INVENTOR A TTORNE Y3 Patented Sept. 20, 1932 warren s'ra'res Parent creme g SAMUEL D. BOSENFELT, OF ST. LOUIS, MISSOURI, ASSIGNOR T FRANKLIN RAILWAY SUPPLY COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE DOOR MECHANISM Application filed February 1 5, 1929. Serial No. 340,213.

The invention relates to door mechanism suitable for furnaces, particularly locomotive furnaces and among the primary objects of the invention are the provision of a door which will encroach as little as possible on the space around the door opening and one which is simple and rugged in character and which can be either manually or mechanically actuated together with means for permitting mechanical actuation without causing movement of the manual actuator. It'is also an object of the invention to provide an improved mounting for the door leaves or sections as well as a simple link mechanism for actuating them in unison. Various advantages that can be realized in connection with the invention will appear from the description hereinafter of a selected and preferred embodiment.

1n the drawing:

Fig. l is a front view of a door mechanism conveniently embodying the invention.

Fig. 2 is a top view of the device shown inFig. 1, with certain parts in horizontal section as indicated by the line and arrows 22 in Fig. 1.

Fig. 3 is a section on the line 33 of Fig. 1 with the operating mechanism shown in side elevation. i

Fig. 4 is a fragmentary front View with the door leaves swung open by the manual actuator, various parts being omitted.

Fig. 5 is a fragmentary view from the left of Fig. 1, illustrating a latch device for holding the manual actuator stationary when not in use.

Fig. 6 is afragmentary top View of an alternate method of securing the operating links to the door segments.

The drawing shows a door frame 10 adapted to be mounted on a locomotive firebox. A couple of door leaves 11, 12 are pivoted to swing across the door opening of the frame 10 toward and away from one another. In the present instance, these leaves 11, 12 are pivoted on the frame 10 above the door opening. The leaves 11, 12 may be operated by a fluid pressure motor 15, controlled by any suitable type of foot pedal valve mechanism 16 familiar to the art the details of which form no part of the present invention. As here shown, motive fluid (as compressed air) is to be supplied to the valve mechanism 16 through a pip-e 17 with a stop and'control valve 18, and is admitted to the motor 15, and exhausted therefrom, through a pipe 19 connected to a passage 20 in the cylinder head 21 (Fig. 2). i

As shown in Figs. 1, 2 and 4, the semi-circular leaves 11, 12 are pivoted about a common axis consisting of a stud 23 on the frame 10,their apertured lugs 24,-25 being located one in front of the other. The leaves 11, 12 are connected to the piston 26 of the motor 15 by a couple of links 27, 28, which are arranged between the cylinder 15 and the door plates 11 and 12 as clearly shown in Figure 2. The link 27 is connected to the door plate 12 by means of the stud 29 and the link 28 to the door plate 11 by means of the stud 30. The outer ends of the links are-mounted upon the operating pin 31 which extends laterally from the piston 26 toward the door opening, also as clearly shown in Figure 2.

It will therefore be seen that when air pressure is admitted to the face of the piston 26 and the piston thereby forced outwardly or to the right, as shown in Figures land 2, the pivot pin 31 will pull upon the two links 27 and 28 in a direction which will raise the two door plates 11 and 12 in opposite'directions on their pivot 23. This is most clearly shown in Figure 4. When the air pressure is released the weight of the leaves 11 and 12 will againclose the door. The hand actuator 32 is'also mounted upon the door pivot 23 and is provided with a lug 33 (see particularly Figure 4) which engages the lug 24 of the door plate 12.

Therefore by pushing the actuator '32 downwardly to the position shown in Figure 4 it will be seen that the door plate 12 will be raised on" the pivot 23 and through the interconnection of the links 27 and 28 the door plate. 11 will-also be raised in the opposite direction so that the door opening will be un covered. a r

The door can be held in several positions of adjustment'by means of the hand actuator through the medium of the latch mechanism which embodies the stationary quadrant-like device 34 inwhich are distributed a plurality of slot-like openings 35 (see Figure 5) adapted to receive and embrace the handle of the manual actuator 32 as .shown.

Furthermore by means of this latch mechanism it is possible to lock the manual actuator 32 in its upper position so that it will not move during the mechanical operation of the door through the medium of the piston26.

It will, therefore, be seen that by my inven tion I am enabled to reduceto a minimum the amount of space necessary for atdoor of.

this type, for by mounting both of the door plates upon the same pivot, they will not swing outwardly over the back head of the boiler as far as they would were the door plates mounted upon separate pivots as is now customary. My improved door is simple and ruggedand can be manually or mechanically actuated as may be. desired with the two actuating mechanisms so arranged as to make it possible, to mechanically actuate the door without causing movement of the manual actuator.

In Fig. 6 I have slightly rearranged the operating links 27a and 28a so that one link can pass the other. In order to do this I have provided the upwardly extending lug a on the door plate 11 and secured the link 28a by means of the pin a on the inside of said lug. The link 27a is placedbehind the link 28a and secured to the door plate 12 by the pin, 29a. The outerends of the links are mounted, as before, on the pin 31 which is carried by the piston 26. This arrangement makes it possible for the links to pass each other during an opening movement of the door plates and provides fora cushioning effect because the pin .31 on, the piston 26 will start to move inwardly or to the left after the two links cross each other, thereby cushioning the movement onthe air in the cylinder 15.

Iclaim: H g

4 1. A door mechanism of thecharacter described comprising swinging leaves pivoted on a common pivot, a cylinder and piston motor mounted in front of the pivot, and connecting links pivoted to the leaves and to opening the door through the medium of said doors openingupon movement of the link pivot away from the door pivot.

4. A fire box door mechanism comprising in combination, a pair of leaves pivoted on a common axis, a lug on one leaf projecting beyond the pivot, a pair of links pivoted together at one end and having the free end of one link pivoted to said lug and the free end of the other link pivoted to the other'leaf on the opposite side of said door pivot, said doors opening upon movement of the link pivot away from the door pivot and a motor for moving said link pivot to open the door as aforesaid.

5. In a door having a pair of pivoted door leaves, the combination of a toggle operating means for opening said leaves arranged so that the links of the toggle can cross each other when the leaves are substantially wide open.

6. In a door having a pair of pivoted door leaves, the combination of a toggle operating means for opening said leaves arranged so that the links of thetoggle can cross each other when the leaves are substantially wide open, together with a fluidaotuated operating piston and cylinder with the piston connected to the toggle pivot whereby the opening movement of the leaves can be cushioned against the fluid in the cylinder as the links cross each other. In testimony signed my name.

whereof I have hereunto SAMUEL D. ROSENFELT.

the piston of said motorysaid links being ar- V ranged to pass each other during operation of the door.

2. A fire box door mechanism comprising in combination, a pair of leaves pivoted on a common axis, a lug onone leaf projecting beyond the pivot, a pair' of links pivoted together at one end and having the free end of one link pivoted to said lugand the free end of the other link pivoted to the other leaf on the opposite side of said door pivot, said doors opening upon movement of the link pivot awayfrom the door pivot, and an I Qperating'handlecoacting' with a leaf for I: 

